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A business name is not normally a trademark. Most states will allow similar names within that state and no state checks its list of available corporate names in other states. So every state in the U.S. could have a "ABC Company, Inc."

Determining who has what trademark rights is an inherently factual issue. Even if you have a federal registration for your mark, that only covers the specific goods and services covered in your certificate of registration.

For a brand new company with no established following, chances are slim that you have any trademark rights unless you have registered the mark. Even then, your trademark rights are only in the goods and services covered by the registration, as noted above.